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<p>文章转载自网络，仅供参考学习。<br>作者：河马（前端/Node.js/Java。公众号：进击的前端101), 原文地址：<a href="https://zhuanlan.zhihu.com/p/264826929" target="_blank" rel="noopener">https://zhuanlan.zhihu.com/p/264826929</a></p>
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<p>webpack 作为最使用最广泛的前端打包工具，已经成为前端工程化基础设施的一部分。而 Webpack 上一个大版本更新已经是18年的时候了，两年时间过去了让我们看看Webpack5 都带来了哪些新特性，对我们的应用又有哪些帮助。</p>
<h1 id="概览"><a href="#概览" class="headerlink" title="概览"></a>概览</h1><p>下面这张图是 Webpack 官方 Changelog 里面截图出来的，可以看到主要有这些方面的提高：</p>
<ul>
<li>通过持久化缓存提高性能</li>
<li>采用更好的持久化缓存算法和默认行为</li>
<li>通过优化 Tree Shaking 和代码生成来减小Bundle体积</li>
<li>提高 Web 平台的兼容性</li>
<li>清除之前为了实现 Webpack4 没有不兼容性变更导致的不合理 state</li>
<li>尝试现在引入重大更改来为将来的功能做准备，以使我们能够尽可能长时间地使用 Webpack 5</li>
</ul>
<p><img src="https://gitee.com/guopengsong1/image-url/raw/master/20201123203814.jpg" alt="官方更新日志"></p>
<p>不得不说，这个官方声明稍微简略了一点，只提到了持久化缓存优化性能和更好的 Tree Shaking，Module federation 这个重大特性居然提都没有提。下面还是跟着小编看看具体都升级了哪些部分。</p>
<h1 id="过时功能移除"><a href="#过时功能移除" class="headerlink" title="过时功能移除"></a>过时功能移除</h1><ul>
<li>首先是去掉了在 Webpack4 里面已经 Warning 的功能。</li>
<li>同时 IgnorePlugin 和 BannerPlugin 现在必须传入一个参数，参数可以是 Object、String或者Function</li>
<li>require.include 语法被废弃，使用时会有 Warning。当然这个行为可以通过 Rule.parser.requireInclude 来把这个语法改成 allowed, deprecated 或者 disabled</li>
<li>去掉自动 Node.js Polyfills 。早期 Webpack 的主要目的是让 Node.js 的模块能够在浏览器运行，但随着模块格局的改变，越来越多的模块只用于浏览器，这个时候再自动 Polyfills 一些 Node 模块（例如 crypto）无疑会增加打包体积，在 Webpack5 之后去掉了这个自动行为</li>
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